Tire bead and method of making the same



July 24, 1923- 1,462,517

M. A. MARQUETTE TIRE BEAD AND METHOD OF MAKING THE SAME Original Filed July 6, 1920 Fig.1.

INVENTOR Mehzon HMurqueTfe.

ATTNEY III/1m Patented July 24, 1923.

UNITED STATES PATENT ounce.-

mvozv Av MARQUETTE, OF CHIOOPEE FALLS, MASSACHUSETTS, ABBIGNOB TO m FISK RUBBER OOMYANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION .03" MASSACHUSETTS.

TIRE BEAD AND METHOD OF MAKING THE SAME.

Application filed July 8, 1920, Serial No. 894,230. Renewed January 9, 1888.

To all whom it m'a concern:

Be it" linownth t I, Mar von A. MAR- imrra, a citizen-of the United States of America, residing at Chico ee Falls, in the county of Hampden and tate of Massachusetts, have invented certain new and useful 1m rovements in Tire Beads and Methods of aking the Same, of wh ch the following in a s ification.

Thisinvention relates to the manufacture oftire casings forpneumatic t1res and particularly to the manufacture and construction of the base edges or head P01110118 of such casings." While the invention may be applicable to head construction of various types it is of particular advantage as applied to clincher beads.

In clincher bead construction it is desirable to have a hard bead. The bead must nevertheless be capable of application to a clincher rim by stretching over the ed e of the After it is in place the bar er it is the better it willfunction.

The object of this invention is to increase the hardnessof the bead construction during the manufacture of the casing and to do this without extra labor or the ex ense of special material for the pur ose. orespecifically, the object is to her en the head by extruding sufficient rubber from the fabric or cord whichis laid around the head in the manufacture of the tirecasing so as to leave the fabric or cord extending from the side walls over the bottom area of the bead with so much less rubber than the fabric or cord normally carries in the side walls that the bead is hardened by pressure during vul canization as desired. Another object is to provide a tire construction having hardened beads such as result from the manufacturing method. Qther objects will appear in the description and claims.

Fi 1 is cross-section of a mold with a clinc er tire mounted therein in the manner usual for vulcanization under pressure but with grooves in the mold adjacent the bead to receivethe extruded rubber;

' Fig. 2 is a partial section of a clincher tire bead indicating the invention;

Fi 3 is a' like view of an ordinary clinc er tire bead;

Fig. 4 is a partial side view of the tire similar to thatsho'wnin Fig. 2; and- Fi 5 is a partial cross section of a chnc er tire of my improved construction ap lied to a clincher rim.

t is customary to give the fabric or cord built into the carcass of a tire a suflicient coating of rubber to attain so far as possible a rubber to rubber contact between the laminations of the carcass and the separate cords of each lamination. This is particularly important in the side walls and across the tread in order to prevent the working of cord against cord. At the bead, however, it is important to have the material hardened for a hard head will best hold its proper position on the rim. The rubber coated fabric or cords composing the side walls are continued around the bead for anchorage. Because of this fact the bead edge is not as hard as desired and in the attempt to make it hard it has been customary to provide for rigid mold pressure against the bead during vulcanization. This pressure, however, does not give all the desired results because the rubber resists the pressure and remains in the bead when finished.

According to my invention, I provide in the mold suitable spaces adjacent both the toe and the heel of the bead edges, said spaces being provided to receive the rubber extrusions which the molding pressure can force out of the fabric or cord during vulcanization. B this means and by the fact that the bead is subjected to great pressure during valcanization sufiicient rubber is extruded from the bead to make it substan-' tially harder than it otherwise would be.

Referring to the drawings I can carry out my invention in one convenient way by providing circumferential recesses 1 in each alf of the mold a and b so as to lie adjacent the heel of the tire bead 5. Adjacent'the toe of the bead I provide a circumferential recess 2 between each mold half a and b and the core 0.

The carcass of the the may be built up of cord or fabric of properly coated laminations the edge portions of which are laid around the bead filler member in the usual way. When the tire is vulcanized under pressure with the parts arranged as in Fig. 1 said ressure will squeeze out sufiicient rubber cm the cord or fabric of the bead edge to make said edge much harder than if the rubber were left in. This extrusion of the rubber is made his by the provision of 1 an 2 arranged respectively at the heel and toe of the bead caviti and adapted to receive the extruded ru r.

The extruded rubber will a pear as circumferential ridges 3 and 4 1 res 2 and 4) on the surface of the bead. e cord or fabric from which such rubber has been squeeeed will vulcaniae into the desired hard fabric covering for the bead. The rid s or lips 4 at the toe of the bead are usu ly trimmed oil and the ridges 8 may be likewise trimmed to V0 e head the usual appearance as in i 8. The ridges at the heel may, however, left on as there 1s space in the usual clincher rim (hsee Fig. 5) to accommodate them without arm The covering acre of the head between points 6 and 7 are hardened as desired and without the use of any special material or labor for the purpose. Once the ves are provided in the mold the invention will be practiced without further labor or attention other than that incident to the ordinawhvulcanization process.

ile I have described a particular way to carry out my invention it is clear that the mold may be cut or d in other wigs to permit the extrusion of rubber from o bead area between points 6 and 7 and therefore my invention in this respect resides not in the precise location as described but in the provision of suitable means to extrude snificient rubber from the cord or fabric between points 6 and 7 (Fig. 5) to accomplish the purpose of hardening the beads in a substantial way over their area.

I claim:

1. A cord or fabric tire casing havin bead edges covered by the laminations 0 its rubber-coated carcass material, said material carryi substantially less rubber coating aroun the beads than in the side walls and tread of the casing.

2. A tire casing having a body portion com fabric and beads composed of anchoring members enclosed by lamlnations of rubbercoated fabric, the rubber-content of the second named laminations being less than that of the first-named laminations.

3. In a tire casin a bead construction of rubber and cord or abric having a hardened covering for the bead comprising the of the coated cord or fabric side-wall construction of the casing with a substantial amount of the rubber coating p out of the cord or fabric.

4. A tire casing including rubber coated fabric or cord laminations built into the carcass with the edges anchored into and around a bead construction, said laminations having substantially less rubber coating of lammations of rubber-coated pressu where they extend around the bead construction for engagement with a rim than they have elsewhere in the carcass.

5. A tire casing comprising a complete tire bead construction including anchored laminations of rubber covered cord or fabric extending into the carcass of the casing said laminations carrying subflantially less rubber coating in the bead than in the rest of the casing.

6. The method of building tire cas' which consists in coating cord or fabric wit rubber for the desired carcass construction, anchoring the edges of the carcass construction around the bead fillers, then curing the tire under pressure in a mold and providing means to extrude a substantial amount of rubber from the cord or fabric around the beads during vulcanization to harden the bead construction.

7. The method of constructing tire bead edges which consists in building the bead edges to a proximate form from the coated cord or f ric of the tire casing, sub'ecting the head 5 to pressure during t vu canization o the casing and providing re- HIP-I at difl'erent points in the mold to 1'6- ceive rubber extru ed from the bead under such pressure whereby the bead construction is hardened.

8. The method of hardening the bead edges of tire casings which consists in extrading rubber from said edges at different points during the vulcanization of the casmg under pressure.

9. The method of hardening the bead edges of tire casings which consists in extrudin rubber from the covering area of such at the toe and heel portions of the bea during vulcanization of the tire casings.

10. The method of hardening the edges of tire casin built of rubberized fabric or cord whic consists in subiecting such edges to pressure during the vu caniaation of t e casings and providing for the extrusion of rubber from the hen portions under such re. 11. The method of hardening the bead ed of tire casings which in provi in circumferential in the vulcamzmg mold adjacent the heels of such edges and pressing the latter during vulcanization so as to force rubber from the edges into such 12. The method of hardening the bead edges of tire casings which consists in providing circumferential ms; in the vulcanizmg mold adjacent the heel and toe portions 0 such and pressing the latter durmg vulcanization so as to rce rubber from the edges into such 18. The method of vulcanizing a clincher tire casntixg which consists in a plying pressureto ebeadportionsof etiresoas III to squeeze out at the toe and heel of the bead construction excess rubber from the bead coverin whereby the bead construction is made harder during vulcanization.

14. The method of vulcanizing clincher tire casings which consists in applying pressure to the casing by a mold adapted to receive at a series of lines extrusions of excess rubber from the bead portions of the casin during the application of such pressure and hardening the surface of the bead for use on a rim.

T. The method of hardening localized portions of a compound fabric and rubber article consisting in extruding rubber from the built-up article at the locality which it is desired to harden.

16. The method of hardening localized portions of a compound fabric and rubber article consisting in vulcanizing the builtuu article between molding surfaces provided at the locality which it is desired to harden with means permitting extrusion of rubber.

MELVON A. MARQUETTE. 

